1. There are two cat5 standards A and B, if you wire a cat5 wire run as long as you make both ends the same you're fine...does not matter past that. For your purposes just for use in your cab do whatever you like.
2. No need to strip all the connectors i've used strip for you.
3. Does not matter, though i'd just wire the full compliment to either A or B standard in case you want to add something else later on, some buttons or what not.